标记单光子源下探测器死时间的量子密钥分配  

Quantum key distribution of detector’s dead time in heralded single photon source

作　　者：何业锋[1,2] 李丽娜 白倩 陈思昊 强雨薇 HE Yefeng;LI Lina;BAI Qian;CHEN Sihao;QIANG Yuwei(School of Cyberspace Security,Xi’an University of Posts and Telecommunications,Xi’an 710121,China;Guangxi Key Laboratory of Cryptography and Information Security,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]西安邮电大学网络空间安全学院,陕西西安710121 [2]桂林电子科技大学广西密码学与信息安全重点实验室,广西桂林541004

出　　处：《量子电子学报》2023年第1期112-119,共8页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(61802302);陕西省自然科学基础研究计划项目(2021JM-462);广西密码学与信息安全重点实验室研究课题(GCIS201923)。

摘　　要：考虑到当光子传输速率过高时,量子密钥分配协议在实际应用中会受到探测器死时间的影响,因此对基于标记单光子源协议的安全密钥生成速率和探测器死时间之间的关系进行了探究。首先,在考虑和不考虑探测器死时间这两种情况下,探究了安全密钥生成速率和探测器死时间之间的关系。结果表明:当光子传输速率过高时,探测器死时间的存在的确会影响安全密钥生成速率。进一步分析了不同探测器死时间下安全密钥速率的生成情况。结果表明:探测器死时间的取值越大,得到的安全密钥生成速率就越低,安全密钥生成速率的极限值和探测器死时间τ之间的关系为4.2/τ。Considering that the quantum key distribution protocol may be affected by the detector dead time in practical applications when the photon transmission rate is too high,the relationship between the security key generation rate based on the heralded single photon source protocol and the detector dead time is explored.First,the relationship between the security key generation rate and the detector dead time is explored with or without considering the detector dead time.The results show that when the photon transmission rate is too high,the dead time of the detector will indeed affect the generation rate of security key.Then the security key generation rate is further analyzed under different detector dead time.The results show that for the same light source,the greater the detector dead time is,the smaller the security key generation rate is,and the relation between the limit value of the security key generation rate and the detector dead timeτis 4.2/τ.

关 键 词：量子光学 量子密钥分配 测量设备无关 标记单光子源 探测器死时间 

分 类 号：TN918[电子电信—通信与信息系统]